Outside Combustion Air Supply; Figure 29: Flue Connection Dimensions; Figure 30: Fresh Air Intake Spigot - Roberts Gorden Blackheat BH15UT Installation, Operation & Service Manual

Vacuum assisted linear, double linear, u-tube, and multi-burner gas fired heating systems
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B
I
LACKHEAT
NSTALLATION

Figure 29: Flue Connection Dimensions

Heater Model
BH 15-30
BH 35-45
BH 50

11.4 Outside Combustion Air Supply

Where necessary, clean air may be ducted into the burner
box through an added spigot on the back of the burner
box replacing the existing dust arrest baffle plate.
See Page 41, Section 11.1 for recommendations on duct
length. Air duct should be as straight as possible. Do not
use bends in excess of 45°. Consult the manufacturer if
more than 2 x 45° offset bends are necessary. The fresh
air duct must be self supporting.

Figure 30: Fresh Air Intake Spigot

Description
Part Number
Dust Arrest Baffle
Fresh Air Intake Spigot
42
O
S
M
PERATION AND
ERVICE
ANUAL
End of Tube
Fan Tube
Fan Model
Torin DSF-133-42
79 mm
Torin DSA-524-202
86 mm
Magnetek JF1G
89 mm
Burner
Dust Arrest
Baffle Plate
07230000
07260000
C
Fan
A
B
C
95 mm
45 mm
102 mm
51 mm
102 mm
51 mm
11.4.1 Air Supply Requirements
When fresh air duct is used, follow one of these rules:
• The flue must penetrate the roof while fresh air can
penetrate any wall. (See Figure 31, A)
• The flue and fresh air supply must penetrate the
same roof, at a minimum of 1 m apart. (See Figure
31, B)
• The flue must penetrate 1 m higher than the fresh air
inlet on the same wall. (See Figure 31, C)
100 mm Diameter
Fresh Air Intake Spigot
A
B
Part Number
C2374B
C2324B
90710000
Sheetmetal
Screw

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